【判断题】在空间力系中,只要主矩不为零,力系一定能够进一步简化。( )
【单选题】My grandparents have _____ the great changes in China _____. [ ]
【单选题】My grandparents have never needed or asked for help. But they did make one___ the other day. They asked if I could help them clean their basement.
【简答题】My grandparents have been buying the same brand of cereal for 40 years; they are very loyal to it.
【简答题】Traduisez la phrase suivante en français avec le lexique de Leçon 2 : 随着经济的不断发展,商店里充满了各种各样的商品。
【判断题】在空间力系中,只要主矩不为零,力系一定能进一步简化。
【简答题】Traduisez la phrase suivante en français avec le lexique de Leçon 2 : 他对这次工作中受到的挫折能处之泰然,是因为他早有了思想准备。
【简答题】Read and choose. 阅读短文,选择正确答案。 My grandparents have a big farm in the forest. There are fif cows, eight pigs, one dog and a fat cat. The dog can swim, but it can't fly. The cat is very funny and sm...